of chicago



Oct. k25., 19272. ,646,54H

W. KAISLING PLUG Filed Jan'. so. 1924 Y llllll" Patented Oct. 25, 1927.

unirse .STATES VV*iui'iENT ortica.

WILLIAM KAIsLINe, or CHICAGO, ILLINOIS, ASSIGNOR 'roy KELLOGGSWITCIIBOARD AND SUPPLY COMPANY, orl CHICAGO, ILLINOIS, A CORPORATION orILLINOIS..y

PLUG.

Application filed January 30, 1,924. Serial No. 689,389.

My invention relates to improvements in connecting plugs, and has todomore particularly with that class of plugs which are adapted to haveconnected thereto one or more instrumentalities. The plug of myinvention. is particularly adapted for use in connection Ywith radioreceiving sets to which may be connected a number of head phones throughthe medium of the plug and jacks" of the receiving set;` andan object ofmy invention is to construct a connecting plugof a few 'and simpleparts, so arranged as to l 'be easily assembled and at the Sametime verydurable and strong.

' It is desirable at times to connect more than one head phone set to'the connectingplug. so that whenwtheconnecting plug is inserted in thevvarious jacks to Vconnect to the various circuits, more than oneindividual may listen in at the same time. Various types of plugs havebeen marketed to accom- .plish the connection of moretlian one head-Vphone set at'the same time such as multiple and series connection plugsand various type offscrew fastenersvv are provided for fastening thecordtips of the headphone sets tothe respective terminals of the con`necting plug. y'This typeof screw'terminal has its disadvantagesbecausewhenconnecting more than one set of headphones to the plugterminals, therord tips must'be held vin position while the terminalscrew is tightened to hold theV cord tips in position. Theplug of myinvention is of the series type in which the plug is vprovided withspring terminal means, `which obviates the necessity of screwterminals.V The cord tips 'Y ofitlie A head sets are inserted under thespring terminals and the' tension l of 'the spring terminals is such astohold the cord tips in engagement therewith against displacement. Y

,A feature of my invention is the provi-v sion of a novel springassembly, in which a `.pair of spring terminalsy areprovided. which areconductively connected'tothe tip and sleeve conductors of the plug, andin association therewith is av spring terminal com- Iprisii'iga pair. ofspring members, insulated from the tip andvsleeve conductors, to pro-'vide series connecting means' for a pair of head phone sets.

AAnother 'feature of my' invention is the provision of al conductingbolt, which. in

addition to serving asa conductor extending to the tip of the plug,italso serves as clamping means for securing the spring terminalcombination in position and also for secur-` ing the sleeve of the plugin position.

For a more complete understanding of my invention, reference may i behad to the accompanying drawing in which like reference characters inthe several views denote Y like parts, and in which Fig. 1 is a view ofthe connecting plug assembled Fig. 2 is a view of the rconnecting plugVwith the handle or sleeve in section t clearly illustrate the plug; Fig.Sis a view similar to 'Fig 2 illustrating another view of the plug;

- Fig. l is an enlarged sectional View taken on the line 4-4 of Fig. 2;

Y Fig. 5 is an enlarged end view of the plug;

and

Fig. 6 is a disassembled perspective viewY ofthe spring terminals and aninsulatingv block associated therewith.

Referring nowin detail to my invention as illustrated in theaccompanying drawing, the plug comprises a shallowcup shaped cup member2when in 'position in said oritice 7. Avconducting stem or bolt 9 eX-tends through the insulating sleeve 4. its one end 10 being threaded andits forward end is provided with an integrally formed spherical shapedtip Contact member 11 which is insulated v from the conducting sleeve 3by means ofthe insulating bushing 12. A spring terminal 13 angular inshape is provided witha disc portion 14 having a central orifice 15 of asize to receive the protruding end of the insulating sleeve 4:. The discportion 14 of the: spring terminal 13 is provided with a pair oforifices 16 diametrically opposite each other which are adapted toreceive a `pair of studs 17 of suitable insulation material which areSecured to the cup member 2 in orifices 18 by meansjof a drive or forcetit, and which exf The disc portion 14. of the spring terminal 13regi-sters with the inner i'ace of the cup member 2 oi;l the plug', butis insulated from the conducting' bolt 9 by means ot the insulatiire;sleeve 4,V and this terminal 13v terms the terininaio'fthe conductingsleeve 3 oi the plug. i also provided with a disc portion 20, and isprovided with a central orifice 21 of'. a size to receive theprotruding` end of the insulating sleeve 4.` The discl portion 20v ot'the terminal 1.9 is also providedwvi-th a pair ot' dian-ietricallyopposite orifices 22 Whirh are adapted to receive the studs 17. Aninsulating plate or bushing- 23 provided with a central orifice oit asize'to receive the protruding' end of the insulating; bushing 4 and apair ot diametrically opposite orifices oit a size to receive the studs17 rests between the disc' portion 14 of the'terminal 13 and the diseportion 2O of the terminal 19 to' insulate one from the other, tbel saidinsulating sleeve 4 insulating, the terminal 19 from the connecting bolt9. I

Aterminal 24 angular in'l shape and provided with a dise portion 25 isprovided with a central orifice 27 of a size to receive the connecting,-bolt 9 and a pair of diametrically opposite orifices 28`are adapted toreceive thestuds 17. An insulating plate or bushing 29, provided with acentral oritice ot a size/to receive the connecting bolt 9, and' a pairoft diametrically opposite orifices ot a size to receive the studs 17,rests between .the disc portion 25V of the terminal 24 andthe discportion 2O otthe terminalY 19 to insulate one from'f'the other. Thethreaded end 1() of the conducting bolt 9 protrudes through the alignedcentral orifices 15. 21 and-27 inthe Vdisc portions 1.4, 2() and 25 ofthe terminals 13, 19 and 24 and the centralorilices in the insulatingbushings 23 and 29 and a slotted nut130 having' screw threadedengapjement with the threaded end 1() ot the conducting bolt 9 isscrewed down against the tace of thedisc 25 ot the terminal 24 andclamps the terminal discs 14, 20 and 25 and iinmlatingH bushings 23 and29 in position. and at the same time terms a conduetinti` means betweenthe tip contact11 of the coni'lucting bolt 9 and its terniinal. 24. Thestuds 17 which as before descril'ied are of suitable insulatingn ed`spring member Which bifurcations form,V

A terminal 19 angular in shape a. pair of spring members 31 and 31',formed to bend inwardly. The terminal 24 is also provided With arearwardly extending spring member 32 formed to bend inwardly. An

'insulating block is provided Witha central oritice 34 o' a size toreceive the end 1t) ofthe cmducting bolt 9. An annular recess 35concentric with the orilice 34 is provided, into which, the nut 130,which clamps the terminal members 13, 1,9 andr24 and insulating bushings23 and .29 together, extends to permit the block 33, to rest against theface of the d isc 25 ot the terminal 24. The face 36' of the. block 33,which rests against the tace ot the disc 25 of the terminal 24 is alsoprovided. with a pair of diametrically opposite oi'itiees 37, inte whichthe end of the studs 17 `extend toprevent turningr of the block 33 onthe conducting bolt 9. The block 33 is secured on the conducting bolt 9by means ot aislotted nut 38 which has screw threaded terminal 19 andthe spring' members 3() and 32 of the terminals 13 and 24, and forcethem outward against their normal tension. The faces 40 and 41 ot'theblock 33 are provided resi'iectivelv with grooves 42 and 43, therebeine; two t@hooves 42 in the tace 40 in juxtaposition with they springmembers 30 and 32 ofthe terminals 13 and 24, and grooves 43 ot whichthere are tivo in the fece 41 of the block 33' are in juxtaposition withthe spring' members 31 and 31 ot the terminal 19. A 'Form oi cord tipthat may be used is illustrated at 45 in Fi .3. Y y

Non' to insert t 11e cord tips suclras 45 of a head phone set intoengagement with the tip terminal 24 :and sleeve terminal 13 of the plugrall that is nece 'ary is to force the cord tip intothe two grooves 42 inthe tace 4() of theblock 33 against the normal tension ot the` .springmembers 30 and 32 ot' the terminals 13 and 24. The tension of the springmembers 3() and 32 vare .such as tohold the cord tips in the grooves 42in the face 4() ot the block 31 against displacement'and insure apositive connection between the spring memliers 30..^md 32 of theterminals 13 and 24 and the cord tips at all times.

I provide a protective sleeve or handle 46 of suitable insulatingmaterial one end of .which threaded and has screw threaded engagementwith the cup member 2 ,of the plug. This handle or sleeve serves as acover or enclosingT member for the plug and also as a handle forgrasping the pluo'.` y VThe handle 46`is alsoprovided with ka pair ofmember orifices 47 for-the stay cords of thehead set cords for purposesas will now be described.

`To `relieve'the strain from the cord, should theV plug be "accidentallywithdrawn by grasping the cord instead of the handle of the plug,a staycord is inserted through the orifice 47 in the handle 46 of the plug andtied so as to allow slack in the individual conductors leadingtothe'cord tips so that Vthe cord tips will not beaccidentally withdrawnfrom under Athe lspringmembers and 32 ofthe terminals 13 and 24.

Assuming that another head phone set is to-be connected to the plug ofmy invention, the cordtip of the head phone set connected to springmemberv 32. marked 1 in thedrawing for the vpurpose of'description iswithdrawn from `the groove 42 in the face 40 of block 33and inserted inthe groove 43 in the face V;41 of the block 33 under'the spring member31-of the terminal 19 opposite the spring member 32 marked 1.v 'The cordtips of the secondheadphone setto be connected to the plug are nowinsertedin the. grooves 42 and T43-in thefaces. 4 0fand 41 of theblock33 f under the spring member 30 marked 2 in the drawing of theterminal13 and the spring member 31l ofthe terminal 19. AFrom theprevious description'it `will be remembered that the terminal 19isinsulated from the terminals `13 and 24 sand the conducting bolt 9,but as the spring members30 and 32 of the terminals 13 and 24 areconductively connectedto the tip and sleeve conductors 11 and ySitisreadily apparentthat when the cord tips of one head set arevconnectedto thezspring membersv 32 and 31 of the terminals 24 and 19 and the cordtips of another head set are connected to the spring members 30 and 31of theterminals 13 and 19 that the two head phone .sets are thusconnected in series. y f

It may be seen that ity is avery simple matterto -connect a head phoneset to the *plug of 'amy inventioirwithout the 'usual trouble of'loosening` screws and v.holding the cord tips in position while thescrews are again tightened, and especially so when tr ing to connect twohead phone sets to the plug at the same time.

VJhile I have described a particular form of my invention it is to beunderstood that changesv and modifications will readily suggestthemselves to those skilled in the art and I therefore aim to cover allsuch changes and modifications as come within the spirit and scope ofthe appended claims..

What I claim as new and desire to secure by United States Let-tersPatent is:

1. In a connecting plug of the character described comprising a tipconductor member and a sleeve conductor member, a cup member Vprovidedlwith a central orifice for receiving one end of said sleeve conductingterminals for and supporting the same, a conduct ingkbolt extension forsaid tip conductor member, a terminal insulated from the terminals ofsaid tip and sleeve members provided with a pair of integrally formedrearwardly' extending` spring members, spring terminals for said tip andsleeveA members provided with integrally formed rearwardly extendingmembers, said conducting bolt extension securing' said tip member inassociation with said sleeve member and-clamping said spring terminalsto said cup member, and means secured to said cup for preventingrotation of said terminals relatively to said conducting bolt extension.

2. In a connecting plug of the character described comprising atipconductor ment' ber and a sleeve conductor member, a cup member forsupporting said sleeve member, a conducting bolt extension for said tipconductingv member, spring terminals for said tip and sleeve conductingmembers, integrally formed rearwardly extending spring members for saidterminals, a terminal insulated from the terminals of said tip andsleeve members provided with a pair of integrally formed rearwardlyextending spring meni-k bers, saidconducting bolt extension securingsaid tip member in association with said sleeve member `andl clampingrthe terminals of said tip and sleeve members and said other terminals tosaid cup member.

3. In a connecting plug of the character described comprising a tipconductor member and a sleeve conductor member a cup member forsupporting saidsleeve member, a conducting bolt extension for said tipconducting member, spring terminals for said tip Vand sleeve conductingmembers, inte-- grally formed rearwardly extending spring members forsaid terminals, a terminal insiilated from the terminals of said tip andsleeve members provided with a pair of integrally formed rearwardlyextending spring members, a block-for separating said rear wardlyextending spring members. said conducting bolt extension securingsaidvtip member in associationwithsaid sleeve member, andsaid springterminals and said blockto said cup member.

4. In a connecting plug of the character ldescribed comprising a tipconductor member and a hollow sleeve conductor member, a cup member forsupporting said hollow sleeve member, a conducting boltextension forsaid tip conduct-or member extending through said hollow sleeve member,spring said tip and sleeve members and insulating bushings forinsulating one from the other, a terminal member insulated from theterminals of the said tip and sleeve conductor members provided with apair of integrally formed rearwardly extending spring members,rearwardly extending integrally formed spring members for said llt;

spring terminals, sti-ids secured to said (cup mem-ber passing throughsaid spring inem-A bers and said bushings to prevent said terminalslfrom rotating relative to each other on said conducting bolt whichclamps said terminals and bushings to said cup member.

5. In a connecting plug ol' `the character described eon'iprising a tipconductor ineinber and a hollow sleeve conductor member, a @up memberAfor supporting said hollow sleeve member, a conducting bolt extensionfor said tip conductor member extending through saidy hollow sleevemember, spring tern'iinals for said tip and sleeve ineinbei's, providedwith reirrwardly e1 dingy spring members, another terminal insulatedfrom said tip and sleeve spring members rovided with a Jair ot inteerallformed rearwardly exten-diifg spring members, said conducting boltclamping said tip and sleeve terminals in conductive relation with theirrespective tip and sleeve conductor members and said other terminal tosaid enp member.

In a connecting plug ot the character described Comprising a tipConductor inember and a hollow sleeve conductor member, a enp member'for supporting said hollow sleeve member, a eondiicting bolt extensionof said tip member extending through saidhollow sleeve for securing saidtip member t0 said sleeve member and said sleeve member to said cupmember, tip and sleeve terminals 'tor said tip and sleeve members, aterminal insulated from said tip and sleeve terminals, said terminalsclamped to said cup member by said bolt, rearwardly extending springmembers for said tip and sleeve terminals and a pair ot rearwardlyextend.-

`ing spring members for said other terminal,

said rearwardlyY extending spring members of said tip and sleeveterminals 'forming engaging means for connection to the terminels ot' ahead set.

7 ln aeonnecting plug of the character described comprising a tipconductor inember and a hollow sleeve conductor member, a cup member forsupporting said hollow' sleeve member, a conducting bolt extension ofsaid tip member extending through said hollow sleevefor securing saidtip member to said slee-.ve 'member and seid sleeve member to said clipmember, tip and. sleeve terininals for said tip and sleeve members, aterminal insulated from said. tip and sleeve terminals,rsajid terminalsclamped to said onp member by said bolt, extending spring members forsaid tip sind sleeve terminals and a. pair of rearwardly extendingspring members 'for said other terminal, saidl rearwardly extendingspring members ot said tip :md sleeve terminals forming engagingmeansfor connection to the terminals of a. heard set, said springmembers of said other terminal formin means for connecting a secondipair of hea sets to said terminals in series connection.

,8. In o mnnecting plug ofthe character" described romprising a tipconductor memhollow sleeve for securing said tip member to said sleevei'nember and said sleeve member to said anp member, tip sind sleeveterminals for said tip and sleeve` members, a

terminal insulated from saidtip and sleeve terminals, said terminalsclamped to said; @up member by said bolt, rearwardly extending springmembers for said tip sleeve terminals and n, .pair of rearwardlyextending spring members for said other terminal, said rearwardlyextending spring members of said tip `and sleeve terminals formingengaging means for connection to the terminals of a hemd set, saidspring meinbers of said other terminal forming means for connecting asecond pair of head sets tol said terminals in Aseries connection, and abloc; seein-ed to said cup member by said bolt for separating seid tipand sleeve sprin members from the spring Ineinbers of sai otherterminal.

Signed by me at Chic-ago, 'm the county of Cook andState of Illinois,this 28th day ot' January, 1924.

i WILLIAM KAISLING.

rearwardly Y

